linux-kernel - Re: Build failure with v4.9-rc1 and GCC trunk -- compiler weirdness

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Date:   Wed, 19 Oct 2016 09:01:33 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc:     Will Deacon <will.deacon@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        james.greenhalgh@....com,
        Gregory Clement <gregory.clement@...e-electrons.com>,
        Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: Build failure with v4.9-rc1 and GCC trunk -- compiler weirdness

On Wed, Oct 19, 2016 at 8:56 AM, Markus Trippelsdorf
<markus@...ppelsdorf.de> wrote:
> On 2016.10.19 at 08:55 -0700, Linus Torvalds wrote:
>>
>> Well, in the meantime we apparently have to live with it. Unless Will
>> is using some unreleased gcc version that nobody else is using and we
>> can just ignore it?
>
> Yes, he is using gcc-7 that is unreleased. (It will be released April
> next year.)

Ahh, self-built? So it's not part of some experimental ARM distro
setup and this will be annoying lots of people?

If so, still think that we could just get rid of the ____ilog2_NaN()
thing as it's not _that_ important, but it's certainly not very
high-priority. Will can do it in his tree too for testing, and it can
remind people to get the gcc problem fixed.

              Linus